121220321212320 has 384 divisors, whose sum is σ = 417607083129600. Its totient is φ = 29312711393280.

The previous prime is 121220321212313. The next prime is 121220321212327. The reversal of 121220321212320 is 23212123022121.

It is an interprime number because it is at equal distance from previous prime (121220321212313) and next prime (121220321212327).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (121220321212327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12500801712 + ... + 12500811408.

It is an arithmetic number, because the mean of its divisors is an integer number (1087518445650).

Almost surely, 2^{121220321212320} is an apocalyptic number.

121220321212320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121220321212320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (208803541564800).

121220321212320 is an abundant number, since it is smaller than the sum of its proper divisors (296386761917280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121220321212320 is a wasteful number, since it uses less digits than its factorization.

121220321212320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15448 (or 15440 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 121220321212320 its reverse (23212123022121), we get a palindrome (144432444234441).

The spelling of 121220321212320 in words is "one hundred twenty-one trillion, two hundred twenty billion, three hundred twenty-one million, two hundred twelve thousand, three hundred twenty".